175 lines
3.8 KiB
C
175 lines
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* User space memory access functions
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*
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* Copyright (C) 1999, 2002 Niibe Yutaka
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* Copyright (C) 2003 - 2008 Paul Mundt
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*
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* Based on:
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* MIPS implementation version 1.15 by
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* Copyright (C) 1996, 1997, 1998 by Ralf Baechle
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* and i386 version.
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*/
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#ifndef __ASM_SH_UACCESS_32_H
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#define __ASM_SH_UACCESS_32_H
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#define __get_user_size(x,ptr,size,retval) \
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do { \
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retval = 0; \
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switch (size) { \
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case 1: \
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__get_user_asm(x, ptr, retval, "b"); \
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break; \
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case 2: \
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__get_user_asm(x, ptr, retval, "w"); \
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break; \
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case 4: \
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__get_user_asm(x, ptr, retval, "l"); \
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break; \
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default: \
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__get_user_unknown(); \
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break; \
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} \
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} while (0)
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#ifdef CONFIG_MMU
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#define __get_user_asm(x, addr, err, insn) \
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({ \
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__asm__ __volatile__( \
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"1:\n\t" \
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"mov." insn " %2, %1\n\t" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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"3:\n\t" \
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"mov #0, %1\n\t" \
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"mov.l 4f, %0\n\t" \
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"jmp @%0\n\t" \
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" mov %3, %0\n\t" \
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".balign 4\n" \
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"4: .long 2b\n\t" \
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".previous\n" \
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".section __ex_table,\"a\"\n\t" \
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".long 1b, 3b\n\t" \
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".previous" \
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:"=&r" (err), "=&r" (x) \
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:"m" (__m(addr)), "i" (-EFAULT), "0" (err)); })
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#else
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#define __get_user_asm(x, addr, err, insn) \
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do { \
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__asm__ __volatile__ ( \
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"mov." insn " %1, %0\n\t" \
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: "=&r" (x) \
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: "m" (__m(addr)) \
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); \
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} while (0)
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#endif /* CONFIG_MMU */
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extern void __get_user_unknown(void);
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#define __put_user_size(x,ptr,size,retval) \
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do { \
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retval = 0; \
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switch (size) { \
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case 1: \
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__put_user_asm(x, ptr, retval, "b"); \
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break; \
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case 2: \
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__put_user_asm(x, ptr, retval, "w"); \
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break; \
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case 4: \
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__put_user_asm(x, ptr, retval, "l"); \
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break; \
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case 8: \
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__put_user_u64(x, ptr, retval); \
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break; \
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default: \
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__put_user_unknown(); \
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} \
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} while (0)
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#ifdef CONFIG_MMU
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#define __put_user_asm(x, addr, err, insn) \
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do { \
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__asm__ __volatile__ ( \
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"1:\n\t" \
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"mov." insn " %1, %2\n\t" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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"3:\n\t" \
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"mov.l 4f, %0\n\t" \
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"jmp @%0\n\t" \
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" mov %3, %0\n\t" \
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".balign 4\n" \
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"4: .long 2b\n\t" \
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".previous\n" \
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".section __ex_table,\"a\"\n\t" \
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".long 1b, 3b\n\t" \
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".previous" \
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: "=&r" (err) \
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: "r" (x), "m" (__m(addr)), "i" (-EFAULT), \
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"0" (err) \
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: "memory" \
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); \
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} while (0)
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#else
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#define __put_user_asm(x, addr, err, insn) \
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do { \
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__asm__ __volatile__ ( \
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"mov." insn " %0, %1\n\t" \
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: /* no outputs */ \
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: "r" (x), "m" (__m(addr)) \
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: "memory" \
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); \
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} while (0)
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#endif /* CONFIG_MMU */
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#if defined(CONFIG_CPU_LITTLE_ENDIAN)
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#define __put_user_u64(val,addr,retval) \
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({ \
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__asm__ __volatile__( \
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"1:\n\t" \
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"mov.l %R1,%2\n\t" \
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"mov.l %S1,%T2\n\t" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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"3:\n\t" \
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"mov.l 4f,%0\n\t" \
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"jmp @%0\n\t" \
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" mov %3,%0\n\t" \
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".balign 4\n" \
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"4: .long 2b\n\t" \
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".previous\n" \
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".section __ex_table,\"a\"\n\t" \
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".long 1b, 3b\n\t" \
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".previous" \
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: "=r" (retval) \
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: "r" (val), "m" (__m(addr)), "i" (-EFAULT), "0" (retval) \
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: "memory"); })
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#else
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#define __put_user_u64(val,addr,retval) \
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({ \
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__asm__ __volatile__( \
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"1:\n\t" \
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"mov.l %S1,%2\n\t" \
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"mov.l %R1,%T2\n\t" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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"3:\n\t" \
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"mov.l 4f,%0\n\t" \
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"jmp @%0\n\t" \
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" mov %3,%0\n\t" \
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".balign 4\n" \
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"4: .long 2b\n\t" \
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".previous\n" \
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".section __ex_table,\"a\"\n\t" \
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".long 1b, 3b\n\t" \
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".previous" \
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: "=r" (retval) \
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: "r" (val), "m" (__m(addr)), "i" (-EFAULT), "0" (retval) \
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: "memory"); })
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#endif
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extern void __put_user_unknown(void);
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#endif /* __ASM_SH_UACCESS_32_H */
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